Fixed some bugs in RecordValuedKeywordCard that resulted from r790.  There aren't really any unit tests covering that class; should write some.
Fixed some bugs in RecordValuedKeywordCard that resulted from r790.  There aren't really any unit tests covering that class; should write some.

git-svn-id: 0dd54ea0a764db829c3ced410e66d9e69022d4f0@791 ed100bfc-0583-0410-97f2-c26b58777a21

embray/PyFITS,spacetelescope/PyFITS,embray/PyFITS,spacetelescope/PyFITS,embray/PyFITS,embray/PyFITS